[Objective]The present experiment was conducted to study dynamic changes of fruit growth and quality in two melon varieties (Eureka and Kino 47), to provide references for quality evaluation. [Method]Dynamic changes of fruit growth, total sugar content, vitamin C content, soluble solid content, citric acid content, citrate synthetase (CS) activity, phosphoenolpyruvate carboxylase (PEPC) activity in fruit of melon varieties were determined and analyzed. [Result]The longitudinal and traverse diameter of fruit showed rapid increase at first, followed by gradual decrease in two varieties The quality parameters of fruit for the two melon varieties appeared same change trends, except vitamin C, the contents of titrated acid, total sugar, soluble solid were higher in Fino 47 than in Eureka from the later stage of fruit development to maturation stage. The activities of two enzymes (CS and PEPC) were positively correlated with acid content in the two melon varieties. [Conclusion]Fino 47, which comprehensive quality was superior to Eureka, was an elite candidate in melon varieties replacement.%[目的]探讨尤力克和菲诺47两个柠檬品种的果实生长及品质发育动态,为科学评价两个品种的果实品质提供参考.[方法]以目前我国主栽柠檬品种尤力克和国外引进良种菲诺47为试材,研究两个柠檬品种果实生长动态、果实总糖、维生素C、可溶性固形物、柠檬酸含量及柠檬酸合成酶(CS)和磷酸烯醇式丙酮酸羧化酶( PEPC)活性的变化动态.[结果]两个品种的果实纵、横径增长量均表现为先快速增大后逐渐减小的趋势,品种间无明显差异；两个品种的果实品质指标变化动态基本一致,除维生素C含量无明显差异外,菲诺47的可滴定酸、总糖、可溶性固形物含量在果实发育后期至成熟期均高于尤力克；两种柠檬酸代谢关键酶CS和PEPC与两个品种的柠橡酸含量变化有较强的正相关性,当柠檬酸含量达到最大值时,两种酶的活性也最大.[结论]菲诺47的果实综合品质优于尤力克,是柠檬换代候选优良品种.
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